What is the "Int Ranch" or "Happy Valley School"?

The actual name of this school was Castile Canyon School and it existed from 1990 to 2000 in California. The school was called the "Int Ranch" by its students, all of them kids of Church of Scientology staff members. The school made a media appearance when ex-Scientologist and "Posse" member Jenna Hill pushed out ridiculous claims about her time there. There is a whole website on this at http://castilecanyonschool.org so I won't go into much more detail.